[lug] inhibit caching

[Zan Lynx]

On Mon, 2004-06-21 at 00:56, Steve SullivanSteveSullivan wrote:
> Often I need to run performance tests on a disk,
> but the file caching of Linux gets in the way.
> 
> Is there a way to inhibit caching for a file
> or disk, so when the data are read they truly
> come from disk instead of from cache?

Look at the O_DIRECT flag.  Use it in your file or device open.  You
will want to read all about it, because it has many restrictions as to
what offsets and block sizes you can read with it.
-- 
Zan Lynx <zlynx at acm.org>
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